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package com.oracle.svm.core.jvmti;

import org.graalvm.nativeimage.Platform;
import org.graalvm.nativeimage.Platforms;
import org.graalvm.nativeimage.c.struct.SizeOf;
import org.graalvm.word.Pointer;

import com.oracle.svm.core.UnmanagedMemoryUtil;
import com.oracle.svm.core.jvmti.headers.JvmtiCapabilities;

/** Methods related to {@link JvmtiCapabilities}. */
public final class JvmtiCapabilitiesUtil {
    @Platforms(Platform.HOSTED_ONLY.class)
    private JvmtiCapabilitiesUtil() {
    }

    public static boolean hasAny(JvmtiCapabilities capabilities) {
        assert capabilities.isNonNull();

        Pointer rawData = (Pointer) capabilities;
        for (int i = 0; i < SizeOf.get(JvmtiCapabilities.class); i++) {
            if (rawData.readByte(i) != 0) {
                return true;
            }
        }
        return false;
    }

    public static void clear(JvmtiCapabilities capabilities) {
        assert capabilities.isNonNull();
        UnmanagedMemoryUtil.fill((Pointer) capabilities, SizeOf.unsigned(JvmtiCapabilities.class), (byte) 0);
    }

    public static void copy(JvmtiCapabilities src, JvmtiCapabilities dst) {
        UnmanagedMemoryUtil.copyForward((Pointer) src, (Pointer) dst, SizeOf.unsigned(JvmtiCapabilities.class));
    }
}
